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Growth Responses of Musk and Plumeless Thistles (Carduus nutans and C. acanthoides) to Damage by Trichosirocalus horridus (Coleoptera: Curculionidae)

Published online by Cambridge University Press:  12 June 2017

Bob Cartwright  and
Loke T. Kok
Bob Cartwright
Affiliation:
Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061
Loke T. Kok
Affiliation:
Dep. Entomol., Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061
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Abstract

Plant response studies were conducted from 1980 to 1982 under pasture and field plot conditions to determine the sublethal effects of the thistle rosette weevil [Trichosirocalus (Ceuthorynchidius) horridus (Panzer)] on Carduus thistles. Response to weevil damage was dependent upon thistle size and growing conditions. Damage by T. horridus destroyed apical dominance, which altered the thistle growth pattern. Infested plants consistently produced more stems and a larger crown than uninfested thistles. Large thistles were stimulated by weevil damage, producing heavier stems and more heads. Small infested thistles developed more quickly than small uninfested thistles. Small and medium infested thistles were shorter and produced fewer seeds and heads than uninfested thistles. The extent of thistle reduction by this weevil will ultimately be determined by the conditions under which thistles grow.

Keywords

Biological weed controlCRUACCRUNU
Type
Weed Biology and Ecology
Information
Weed Science , Volume 33 , Issue 1 , January 1985 , pp. 57 - 62
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

Literature Cited

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